User's Manual

Smart Machine Smart Decision

SIM5320A_Hardware Design_V1.01 2011-2-29

available network data back to the location server, the mobile calculates the location on the handset and

passes the result to the requesting entity.

In standalone (autonomous) mode, the handset demodulates the data directly from the GPS satellites.

This mode has some reduced cold-start sensitivity, and a longer time to first fix as compared to the assisted

modes. However, it requires no server interaction and works out of network coverage.

This combination of GPS measurements and available network information provides:

● High-sensitivity solution that works in all terrains: Indoor, outdoor, urban, and rural

● High availability that is enabled by using both satellite and network information

Therefore, while network solutions typically perform poorly in rural areas and areas of poor cell

geometry/density, and while unassisted, GPS-only solutions typically perform poorly indoors. The

SIM5320A GPS solution provides optimal time to fix, accuracy, sensitivity, availability, and reduced

network utilization in both of these environments, depending on the given condition.

3.12.3 Application Guide

Users can adopt an active antenna or a passive antenna as GPS signal transceiver. In this document, all

GPS specification mentioned is from passive antenna. The following is the reference circuit.

Figure 39: Active antenna circuit